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parser.py
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parser.py
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from os.path import abspath, dirname, exists, join
import sys
from .lexer import Lexer
from .ply import yacc
import inspect
DEBUG = False
# When using something like pyinstaller, the __file__ attribute isn't actually
# set correctly, so the parse file isn't able to be saved anywhere sensible.
# In these cases, just use a temporary directory, it doesn't take too long to
# generate the tables anyways...
if exists(dirname(__file__)):
pickle_file = abspath(join(dirname(__file__), 'parsetab.dat'))
else:
import tempfile
fobj = tempfile.NamedTemporaryFile()
pickle_file = fobj.name
if sys.version_info[0] < 3:
def iteritems(d):
return iter(d.iteritems())
string_types = (str, unicode)
else:
def iteritems(d):
return iter(d.items())
string_types = (str, bytes)
class HclParser(object):
#
# Tokens
#
tokens = (
'BOOL',
'FLOAT',
'NUMBER',
'COMMA',
'COMMENT',
'MULTICOMMENT',
'IDENTIFIER',
'EQUAL',
'STRING',
'ADD',
'MINUS',
'MULTIPLY',
'DIVIDE',
'LEFTBRACE',
'RIGHTBRACE',
'LEFTBRACKET',
'RIGHTBRACKET',
'PERIOD',
'EPLUS',
'EMINUS',
'LEFTPAREN',
'RIGHTPAREN',
'QMARK',
'COLON',
'ASTERISK_PERIOD',
'GT',
'LT',
'EQ',
'NE',
'LE',
'GE',
)
#
# Yacc parser section
#
def objectlist_flat(self, lt, replace):
'''
Similar to the dict constructor, but handles dups
HCL is unclear on what one should do when duplicate keys are
encountered. These comments aren't clear either:
from decoder.go: if we're at the root or we're directly within
a list, decode into dicts, otherwise lists
from object.go: there's a flattened list structure
'''
d = {}
for k, v in lt:
if k in d.keys() and not replace:
if type(d[k]) is list:
d[k].append(v)
else:
d[k] = [d[k], v]
else:
if isinstance(v, dict):
dd = d.setdefault(k, {})
for kk, vv in iteritems(v):
if type(dd) == list:
dd.append({kk: vv})
elif kk in dd.keys():
if hasattr(vv, 'items'):
for k2, v2 in iteritems(vv):
dd[kk][k2] = v2
else:
d[k] = [dd, {kk: vv}]
else:
dd[kk] = vv
else:
d[k] = v
return d
def p_top(self, p):
'''
top : empty
| objectlist
'''
if DEBUG:
self.print_p(p)
p[0] = self.objectlist_flat(p[1], True)
def p_empty_0(self, p):
'''
empty :
'''
if DEBUG:
self.print_p(p)
p[0] = []
def p_objectlist_0(self, p):
"objectlist : objectitem"
if DEBUG:
self.print_p(p)
p[0] = [p[1]]
def p_objectlist_1(self, p):
"objectlist : objectlist objectitem"
if DEBUG:
self.print_p(p)
p[0] = p[1] + [p[2]]
def p_objectlist_2(self, p):
"objectlist : objectlist COMMA objectitem"
if DEBUG:
self.print_p(p)
p[0] = p[1] + [p[3]]
def p_object_0(self, p):
"object : LEFTBRACE objectlist RIGHTBRACE"
if DEBUG:
self.print_p(p)
p[0] = self.objectlist_flat(p[2], False)
def p_object_1(self, p):
"object : LEFTBRACE objectlist COMMA RIGHTBRACE"
if DEBUG:
self.print_p(p)
p[0] = self.objectlist_flat(p[2], False)
def p_object_2(self, p):
"object : LEFTBRACE RIGHTBRACE"
if DEBUG:
self.print_p(p)
p[0] = {}
def p_objectkey_0(self, p):
'''
objectkey : IDENTIFIER
| STRING
'''
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_objectkey_1(self, p):
'''
objectkey : IDENTIFIER ADD number
| number ADD IDENTIFIER
| IDENTIFIER MINUS number
| number MINUS IDENTIFIER
| IDENTIFIER MULTIPLY number
| number MULTIPLY IDENTIFIER
| IDENTIFIER DIVIDE number
| number DIVIDE IDENTIFIER
'''
if DEBUG:
self.print_p(p)
p[0] = (str(p[1]), str(p[2]), str(p[3]))
def p_objectbrackets_0(self, p):
"objectbrackets : IDENTIFIER LEFTBRACKET objectkey RIGHTBRACKET"
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[2] + p[3] + p[4]
def p_objectbrackets_1(self, p):
'''
objectbrackets : IDENTIFIER LEFTBRACKET objectkey RIGHTBRACKET PERIOD IDENTIFIER
| IDENTIFIER LEFTBRACKET NUMBER RIGHTBRACKET PERIOD IDENTIFIER
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[2] + str(p[3]) + p[4] + p[5] + p[6]
def p_objectitem_0(self, p):
'''
objectitem : objectkey EQUAL number
| objectkey EQUAL BOOL
| objectkey EQUAL STRING
| objectkey EQUAL IDENTIFIER
| objectkey EQUAL object
| objectkey EQUAL objectkey
| objectkey EQUAL list
| objectkey EQUAL objectbrackets
| objectkey EQUAL function
| objectkey EQUAL booleanexp
| objectkey COLON number
| objectkey COLON BOOL
| objectkey COLON STRING
| objectkey COLON IDENTIFIER
| objectkey COLON object
| objectkey COLON objectkey
| objectkey COLON list
| objectkey COLON objectbrackets
| objectkey COLON booleanexp
'''
if DEBUG:
self.print_p(p)
p[0] = (p[1], p[3])
def p_objectitem_1(self, p):
"objectitem : block"
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_objectitem_2(self, p):
'''
objectitem : objectkey EQUAL objectkey QMARK objectkey COLON objectkey
| objectkey EQUAL objectkey QMARK objectkey COLON number
| objectkey EQUAL objectkey QMARK objectkey COLON BOOL
| objectkey EQUAL objectkey QMARK objectkey COLON function
| objectkey EQUAL objectkey QMARK number COLON objectkey
| objectkey EQUAL objectkey QMARK BOOL COLON objectkey
| objectkey EQUAL objectkey QMARK function COLON objectkey
| objectkey EQUAL objectkey QMARK number COLON number
| objectkey EQUAL objectkey QMARK number COLON BOOL
| objectkey EQUAL objectkey QMARK number COLON function
| objectkey EQUAL objectkey QMARK BOOL COLON number
| objectkey EQUAL objectkey QMARK BOOL COLON function
| objectkey EQUAL objectkey QMARK BOOL COLON BOOL
| objectkey EQUAL booleanexp QMARK objectkey COLON objectkey
| objectkey EQUAL booleanexp QMARK objectkey COLON number
| objectkey EQUAL booleanexp QMARK objectkey COLON BOOL
| objectkey EQUAL booleanexp QMARK objectkey COLON function
| objectkey EQUAL booleanexp QMARK number COLON objectkey
| objectkey EQUAL booleanexp QMARK BOOL COLON objectkey
| objectkey EQUAL booleanexp QMARK function COLON objectkey
| objectkey EQUAL booleanexp QMARK number COLON number
| objectkey EQUAL booleanexp QMARK number COLON BOOL
| objectkey EQUAL booleanexp QMARK number COLON function
| objectkey EQUAL booleanexp QMARK BOOL COLON number
| objectkey EQUAL booleanexp QMARK BOOL COLON function
| objectkey EQUAL booleanexp QMARK BOOL COLON BOOL
'''
if DEBUG:
self.print_p(p)
p[0] = (p[1], p[3] + p[4] + str(p[5]) + p[6] + str(p[7]))
def p_operator_0(self, p):
'''
operator : EQ
| NE
| LT
| GT
| LE
| GE
'''
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_booleanexp_0(self, p):
'''
booleanexp : objectkey operator objectkey
| objectkey operator number
| number operator objectkey
'''
if DEBUG:
self.print_p(p)
p[0] = str(p[1]) + p[2] + str(p[3])
def p_block_0(self, p):
"block : objectkey object"
if DEBUG:
self.print_p(p)
p[0] = (p[1], p[2])
def p_block_1(self, p):
"block : objectkey block"
if DEBUG:
self.print_p(p)
p[0] = (p[1], {p[2][0]: p[2][1]})
def p_list_0(self, p):
'''
list : LEFTBRACKET listitems RIGHTBRACKET
| LEFTBRACKET listitems COMMA RIGHTBRACKET
'''
if DEBUG:
self.print_p(p)
p[0] = p[2]
def p_list_1(self, p):
'''
list : LEFTBRACKET RIGHTBRACKET
| LEFTPAREN RIGHTPAREN
'''
if DEBUG:
self.print_p(p)
p[0] = []
def p_list_2(self, p):
'''
list : LEFTPAREN LEFTBRACKET listitems RIGHTBRACKET PERIOD PERIOD PERIOD RIGHTPAREN
'''
if DEBUG:
self.print_p(p)
p[0] = [p[3]] + [p[5] + p[6] + p[7]]
def p_list_of_lists_0(self, p):
'''
list_of_lists : list COMMA list
'''
if DEBUG:
self.print_p(p)
p[0] = p[1], p[3]
def p_list_of_lists_1(self, p):
'''
list_of_lists : list_of_lists COMMA list
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + (p[3],)
def p_function_0(self, p):
'''
function : IDENTIFIER LEFTPAREN listitems RIGHTPAREN
| IDENTIFIER LEFTPAREN list_of_lists RIGHTPAREN
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[2] + self.flatten(p[3]) + p[4]
def p_function_1(self, p):
'''
function : IDENTIFIER LEFTPAREN listitems COMMA RIGHTPAREN
| IDENTIFIER LEFTPAREN list_of_lists COMMA RIGHTPAREN
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[2] + self.flatten(p[3]) + p[5]
def p_function_2(self, p):
'''
function : IDENTIFIER LEFTPAREN list PERIOD PERIOD PERIOD RIGHTPAREN
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[2] + self.flatten(p[3]) + p[4] + p[5] + p[6] + p[7]
def p_function_3(self, p):
'''
function : IDENTIFIER LEFTPAREN LEFTBRACKET list_of_lists RIGHTBRACKET PERIOD PERIOD PERIOD RIGHTPAREN
'''
if DEBUG:
self.print_p(p)
p[0] = (
p[1] + p[2] + p[3] + self.flatten(p[4]) + p[5] + p[6] + p[7] + p[8] + p[9]
)
def flatten(self, value):
if isinstance(value, dict):
return (
"{"
+ ",".join(key + ":" + self.flatten(value[key]) for key in value)
+ "}"
)
if isinstance(value, list):
return ",".join(self.flatten(v) for v in value)
if isinstance(value, tuple):
return " ".join(self.flatten(v) for v in value)
if isinstance(value, string_types):
if sys.version_info[0] < 3:
if value.isdigit(): # python2 support, return numbers as is
return value
else:
if value.isnumeric(): # return numbers as is
return value
return (
'"' + value + '"' # wrap string literals in double quotes
if value not in ['+', '-'] and '.' not in value
else value # but not if its var interpolation or an operator
)
raise TypeError(
'%s is of type %s; expected type of dict, list, tuple, or str',
str(value),
type(value),
)
def p_listitems_0(self, p):
'''
listitems : listitem
| function
| object COMMA
| objectkey COMMA
| list COMMA
'''
if DEBUG:
self.print_p(p)
p[0] = [p[1]]
def p_listitems_1(self, p):
'''
listitems : listitems COMMA listitem
| listitems COMMA function
| listitems COMMA objectkey
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + [p[3]]
def p_listitems_2(self, p):
'''
listitems : object COMMA object
| object COMMA objectkey
| objectkey COMMA objectkey
| objectkey COMMA object
| objectkey COMMA list
'''
if DEBUG:
self.print_p(p)
p[0] = [p[1], p[3]]
def p_listitems_3(self, p):
'''
listitems : objectkey COMMA IDENTIFIER ASTERISK_PERIOD IDENTIFIER
'''
if DEBUG:
self.print_p(p)
p[0] = [p[1], p[3] + p[4] + p[5]]
def p_listitems_4(self, p):
'''
listitems : objectkey list
'''
if DEBUG:
self.print_p(p)
p[2].insert(0, p[1])
p[0] = p[2]
def p_listitems_5(self, p):
'''
listitems : listitems COMMA COMMENT
| listitems COMMA MULTICOMMENT
'''
# skip comments in lists
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_listitem_0(self, p):
'''
listitem : number
| object
| objectkey
| objectbrackets
'''
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_listitem_1(self, p):
'''
listitem : IDENTIFIER ASTERISK_PERIOD IDENTIFIER
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[2] + p[3]
def p_number_0(self, p):
"number : int"
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_number_1(self, p):
"number : float"
if DEBUG:
self.print_p(p)
p[0] = float(p[1])
def p_number_2(self, p):
"number : int exp"
if DEBUG:
self.print_p(p)
p[0] = float("{0}{1}".format(p[1], p[2]))
def p_number_3(self, p):
"number : float exp"
if DEBUG:
self.print_p(p)
p[0] = float("{0}{1}".format(p[1], p[2]))
def p_number_4(self, p):
'''
number : number ADD number
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] + p[3]
def p_number_5(self, p):
'''
number : number MINUS number
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] - p[3]
def p_number_6(self, p):
'''
number : number MULTIPLY number
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] * p[3]
def p_number_7(self, p):
'''
number : number DIVIDE number
'''
if DEBUG:
self.print_p(p)
p[0] = p[1] / p[3]
def p_int_0(self, p):
"int : MINUS int"
if DEBUG:
self.print_p(p)
p[0] = -p[2]
def p_int_1(self, p):
"int : NUMBER"
if DEBUG:
self.print_p(p)
p[0] = p[1]
def p_float_0(self, p):
"float : MINUS float"
p[0] = p[2] * -1
def p_float_1(self, p):
"float : FLOAT"
p[0] = p[1]
def p_exp_0(self, p):
"exp : EPLUS NUMBER"
if DEBUG:
self.print_p(p)
p[0] = "e{0}".format(p[2])
def p_exp_1(self, p):
"exp : EMINUS NUMBER"
if DEBUG:
self.print_p(p)
p[0] = "e-{0}".format(p[2])
def p_comment_0(self, p):
'''
block : COMMENT
| MULTICOMMENT
'''
if DEBUG:
self.print_p(p)
p[0] = ("comment-L{:03d}".format(p.lineno(1)), p[1])
# useful for debugging the parser
def print_p(self, p):
if DEBUG:
name = inspect.getouterframes(inspect.currentframe(), 2)[1][3]
print(
'%20s: %s' % (name, ' | '.join([str(p[i]) for i in range(0, len(p))]))
)
def p_error(self, p):
# Derived from https://groups.google.com/forum/#!topic/ply-hack/spqwuM1Q6gM
# Ugly hack since Ply doesn't provide any useful error information
try:
frame = inspect.currentframe()
cvars = frame.f_back.f_locals
expected = "; expected %s" % (
', '.join(cvars['actions'][cvars['state']].keys())
)
except:
expected = ""
if p is not None:
msg = "Line %d, column %d: unexpected %s%s" % (
p.lineno,
p.lexpos,
p.type,
expected,
)
else:
msg = "Unexpected end of file%s" % expected
raise ValueError(msg)
def __init__(self):
self.yacc = yacc.yacc(
module=self, debug=False, optimize=1, debugfile=pickle_file
)
def parse(self, s, export_comments=None):
return self.yacc.parse(
s, lexer=Lexer(export_comments=export_comments), debug=DEBUG
)